Probability density function of the number of embryos collected from superovulated Nelore breed donors

Scientia Agricola

Renato Travassos Beltrame¹  Luis Gustavo Barioni²  Celia Raquel Quirino¹  Ozanival Dario Dantas² 

[1] ,UENF CCTA Lab. de Reprodução e Melhoramento Genético AnimalCampos dos Goytacazes RJ ,Brasil

关键词: zebu;    cattle;    reproduction;    model;    zebu;    vaca;    reprodução;    modelo;   

DOI  :  10.1590/S0103-90162009000400003

来源: SciELO

【 摘 要 】

Several models have been developed to evaluate reproductive status of cows through concentration of progesterone in milk, the effect of sex selection in the commercial production of herds and bioeconomic performance of the multiple ovulation and embryo transfer system in select herds. However, models describing the production of embryos in superovulated females have yet to be developed. A probability density function of the number of embryos collected by donors of the Nelore breed was determined. Records of 61,928 embryo collections from 26,767 donors from 1991 to 2005 were analyzed. Data were provided by the Brazilian Association of Creators of Zebu and Controlmax Consultoria e Sistemas Ltda. The probability density function of the number of viable embryos was modeled using exponential and gamma distributions. Parameter fitting was carried out for maximum likelihood using a non-linear gradient method. Both distributions presented similar level of precision: root mean square error (RMSE) = 0.0072 and 0.0071 for the exponential and gamma distributions, respectively; both distributions are thus deemed suitable for representing the probability density function of embryo production by Nelore females.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License